Cofiniteness and finiteness of local cohomology modules over regular local rings

Czechoslovak Mathematical Journal

Jafar A'zami, Naser Pourreza¹ 

关键词: cofinite module;    Cohen-Macaulay ring;    Krull dimension;    local cohomology;    regular ring;   

DOI  :  10.21136/CMJ.2017.0116-16

学科分类：数学（综合）

来源: Akademie Ved Ceske Republiky

【 摘 要 】

  Let $(R,\mathfrak m)$ be a commutative Noetherian regular local ring of dimension $d$ and $I$ be a proper ideal of $R$ such that ${\rm mAss}_R(R/I)={\rm Assh}_R(I)$. It is shown that the $R$-module $H^{{\rm ht}(I)}_I(R)$ is $I$-cofinite if and only if ${\rm cd}(I,R)={\rm ht}(I)$. Also we present a sufficient condition under which this condition the $R$-module $H^i_I(R)$ is finitely generated if and only if it vanishes.

【 授权许可】

Unknown